Detailed Instructions: You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.
Problem:Sentence: Chhyaang, tongba (fermented millet or barley) and rakshi are alcoholic beverages from other parts of Nepal which are found in Kathmandu. 
Question: What goes through a fermentation process to create tongba?
Solution:
fermented millet or barley.